Silicon removal and lithium extraction device based on electrodialysis

Abstract

The utility model relates to the technical field of silicon removal and lithium extraction devices, in particular to an electrodialysis-based silicon removal and lithium extraction device, which comprises an electrodialysis silicon removal device, a silicon filter element is fixedly mounted in the electrodialysis silicon removal device through a mounting mechanism, and an electrodialysis fresh water inlet is mounted on the outer surface of the electrodialysis silicon removal device close to the bottom end in a penetrating manner. A silicon-removed fresh water outlet is formed in the outer surface, close to the top of the silicon filtering element, of the electrodialysis silicon remover in a penetrating manner, and the whole device can remove silicon in electrodialysis fresh water, so that the loss of lithium is greatly reduced, and the lithium yield and the stability of the system are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of silicon removal and lithium extraction devices, in particular to a silicon removal and lithium extraction device based on electrodialysis. Background Art

[0002] Lithium extraction from salt lake brine refers to the process of extracting lithium from lithium-containing salt lake brine. Salt lake brine has abundant lithium resources, and lithium extraction from salt lakes has obvious resource and cost advantages. Therefore, extracting lithium from salt lakes has become an inevitable trend in the development of lithium resources.

[0003] There are many methods for extracting lithium from salt lake brine. Among them, the advantage of electrodialysis membrane over nanofiltration membrane is that it can withstand higher lithium concentrations and requires less investment. At the same time, electrodialysis fresh water is rich in silicon, which needs to be discharged to reduce lithium loss, increase lithium yield and system stability. However, electrodialysis technology itself cannot remove uncharged silicon particles.

[0004] Therefore, it is necessary to design a silicon removal and lithium extraction device based on electrodialysis to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of the utility model is to provide a silicon removal and lithium extraction device based on electrodialysis, which can remove silicon in electrodialysis fresh water, thereby greatly reducing lithium loss, greatly improving lithium yield and system stability, thereby solving the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A desiliconization and lithium extraction device based on electrodialysis comprises an electrodialysis desiliconizer, a silicon filter element is fixedly installed inside the electrodialysis desiliconizer through a mounting mechanism, an electrodialysis fresh water inlet is penetrated and installed near the bottom of the outer surface of the electrodialysis desiliconizer, and a desiliconization fresh water outlet is penetrated and installed near the top of the silicon filter element on the outer surface of the electrodialysis desiliconizer.

[0008] As a preferred solution of the utility model, the top and bottom ends of the electrodialysis desiliconizer are respectively fixedly mounted with an upper mounting flange and a lower mounting flange by fixing bolts, and a desiliconization and lithium extraction chamber is provided inside the electrodialysis desiliconizer.

[0009] As a preferred solution of the utility model, a three-way pipeline is installed through the center of the top surface of the upper mounting flange, and a negative pressure connection port and a high pressure connection port are respectively provided near both ends of the three-way pipeline. Gas electric valves are fixedly installed on the three-way pipeline near the negative pressure connection port and the high pressure connection port.

[0010] As a preferred solution of the utility model, a sewage pipe is installed through the bottom center of the lower mounting flange, and a sewage electric valve is fixedly installed on the sewage pipe.

[0011] As a preferred solution of the utility model, the mounting mechanism includes a mounting seat fixedly installed around the inner wall of the electrodialysis desiliconizer, a plurality of groups of positioning columns distributed in a ring are fixedly installed on the top surface of the mounting seat, any group of the plurality of groups of positioning columns distributed in a ring are adapted to limit nuts, a separation cavity is arranged inside the silicon filter element, a mounting ring is fixedly installed around the top of the silicon filter element, and the mounting ring is penetrated by fixing screw holes corresponding to the plurality of groups of positioning columns distributed in a ring.

[0012] As a preferred solution of the utility model, any one of the several groups of annularly distributed positioning columns is composed of a positioning section and a threaded section, and the positioning section passes through the interior of the fixing screw hole, and the limiting nut and the threaded section are spirally connected.

[0013] Beneficial effect: In view of the problem that the existing electrodialysis technology itself is unable to remove uncharged silicon particles, the utility model can introduce electrodialysis fresh water into the interior of the electrodialysis desiliconizer through the electrodialysis fresh water inlet, and use the silicon filter element to separate and filter the silicon in the electrodialysis fresh water. The electrodialysis fresh water without silicon generated after filtration will be discharged through the silicon removal fresh water outlet. At the same time, the silicon impurities generated by the filtration will adhere to the outer surface of the silicon filter element, so that the silicon in the electrodialysis fresh water can be removed, thereby greatly reducing the loss of lithium and greatly improving the lithium yield and the stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the overall three-dimensional external structure diagram of the utility model;

[0015] Figure 2 It is a three-dimensional expanded structural diagram of the electrodialysis desiliconizer in the utility model;

[0016] Figure 3 It is a three-dimensional disassembled structural diagram of the installation mechanism in the utility model;

[0017] Figure 4 It is a three-dimensional enlarged structural diagram of the electrodialysis desiliconizer in the utility model;

[0018] In the figure: 1. Electrodialysis desiliconizer; 11. Fixing bolts; 12. Upper mounting flange; 121. Three-way pipe; 122. Negative pressure connection port; 123. High pressure connection port; 124. Gas electric valve; 13. Lower mounting flange; 131. Drain pipe; 132. Drain electric valve; 14. Desiliconization and lithium extraction chamber; 2. Mounting mechanism; 21. Mounting seat; 22. Positioning column; 221. Positioning section; 222. Threaded section; 23. Limiting nut; 3. Silica filter element; 31. Separation chamber; 32. Mounting ring; 33. Fixing screw hole; 4. Electrodialysis fresh water inlet; 5. Desiliconization fresh water outlet. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0020] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant literature, and several embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0021] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may also be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in this article includes any and all combinations of one or more related listed items.

[0023] See also Figure 1-4 , the utility model provides a technical solution:

[0024] A desiliconization and lithium extraction device based on electrodialysis comprises an electrodialysis desiliconizer 1, a silicon filter element 3 is fixedly installed inside the electrodialysis desiliconizer 1 through a mounting mechanism 2, an electrodialysis fresh water inlet 4 is installed through the outer surface of the electrodialysis desiliconizer 1 near the bottom, and a desiliconization fresh water outlet 5 is installed through the outer surface of the electrodialysis desiliconizer 1 near the top of the silicon filter element 3.

[0025] Specifically, the top and bottom ends of the electrodialysis desiliconizer 1 are respectively fixedly mounted with an upper mounting flange 12 and a lower mounting flange 13 by fixing bolts 11, and a desiliconization and lithium extraction chamber 14 is provided inside the electrodialysis desiliconizer 1. Electrodialysis fresh water can be introduced into the electrodialysis desiliconizer 1 through an electrodialysis fresh water inlet 4, and silicon in the electrodialysis fresh water can be separated and filtered by a silicon filter element 3. Electrodialysis fresh water free of silicon produced after filtration will be discharged through a desiliconization fresh water outlet 5, and silicon impurities produced by filtration will adhere to the outer surface of the silicon filter element 3, so that silicon in the electrodialysis fresh water can be removed, thereby greatly reducing lithium loss and greatly improving lithium yield and system stability.

[0026] Preferably, a three-way pipeline 121 is installed through the center of the top surface of the upper mounting flange 12, and a negative pressure connection port 122 and a high pressure connection port 123 are respectively provided near both ends of the three-way pipeline 121. A gas electric valve 124 is fixedly installed near the negative pressure connection port 122 and the high pressure connection port 123 on the three-way pipeline 121. When performing silicon removal filtration and separation, the gas electric valve 124 near the high pressure connection port 123 is closed, and the gas electric valve 124 near the negative pressure connection port 122 is opened. The negative pressure can accelerate the efficiency of silicon removal and lithium extraction. When discharging sewage, the gas electric valve 124 near the negative pressure connection port 122 is closed, and the gas electric valve 124 near the high pressure connection port 123 is opened. The silicon impurities attached to the outer surface of the silicon filter element 3 are cleaned by high-pressure gas to prevent blockage.

[0027] Preferably, a drain pipe 131 is installed through the bottom center of the lower mounting flange 13, and a drain electric valve 132 is fixedly installed on the drain pipe 131. During the silicon impurity cleaning process, the drain electric valve 132 is opened, and the silicon impurities generated by cleaning the outer surface of the silicon filter element 3 with high-pressure gas will be discharged through the drain pipe 131, thereby facilitating the subsequent silicon removal and lithium extraction work;

[0028] Preferably, the mounting mechanism 2 includes a mounting seat 21 fixedly mounted around the inner wall of the electrodialysis desiliconizer 1, a plurality of groups of annularly distributed positioning columns 22 are fixedly mounted on the top surface of the mounting seat 21, any group of the plurality of annularly distributed positioning columns 22 are adapted to be fitted with a limiting nut 23, a separation chamber 31 is arranged inside the silicon filter element 3, a mounting ring 32 is fixedly mounted around the top of the silicon filter element 3, and fixing screw holes 33 corresponding to the plurality of groups of annularly distributed positioning columns 22 are provided through the mounting ring 32, and the stability and reliability of the silicon filter element 3 during operation can be ensured by setting the mounting mechanism 2;

[0029] Preferably, any one of the several groups of annularly distributed positioning columns 22 is composed of a positioning section 221 and a threaded section 222, and the positioning section 221 passes through the interior of the fixing screw hole 33, and the limiting nut 23 and the threaded section 222 are spirally connected. The silicon filter element 3 can be positioned by the provided positioning section 221 and the fixing screw hole 33, and the silicon filter element 3 can be locked by the provided limiting nut 23 and the threaded section 222, which is convenient for disassembly and assembly and can effectively prevent the threads from slipping due to seepage.

[0030] In summary, the utility model can remove silicon in electrodialysis fresh water, thereby greatly reducing the loss of lithium and greatly improving the lithium yield and system stability.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for removing silicon and extracting lithium based on electrodialysis, comprising an electrodialysis desiliconizer (1), characterized in that: A silicon filter element (3) is fixedly mounted inside the electrodialysis desiliconizer (1) via a mounting mechanism (2); an electrodialysis fresh water inlet (4) is installed through the outer surface of the electrodialysis desiliconizer (1) near the bottom; and a desiliconized fresh water outlet (5) is installed through the outer surface of the electrodialysis desiliconizer (1) near the top of the silicon filter element (3).

2. The device for removing silicon and extracting lithium based on electrodialysis according to claim 1, characterized in that: An upper mounting flange (12) and a lower mounting flange (13) are respectively fixedly mounted on the top and bottom ends of the electrodialysis desiliconizer (1) via fixing bolts (11), and a desiliconization and lithium extraction chamber (14) is provided inside the electrodialysis desiliconizer (1).

3. The device for removing silicon and extracting lithium based on electrodialysis according to claim 2, characterized in that: A three-way pipeline (121) is installed through the center of the top surface of the upper mounting flange (12), and a negative pressure connection port (122) and a high pressure connection port (123) are respectively provided near both ends of the three-way pipeline (121), and a gas electric valve (124) is fixedly installed on the three-way pipeline (121) near the negative pressure connection port (122) and the high pressure connection port (123).

4. The device for removing silicon and extracting lithium based on electrodialysis according to claim 2, characterized in that: A sewage discharge pipe (131) is installed through the center of the bottom of the lower mounting flange (13), and a sewage discharge electric valve (132) is fixedly installed on the sewage discharge pipe (131).

5. The device for removing silicon and extracting lithium based on electrodialysis according to claim 1, characterized in that: The mounting mechanism (2) comprises a mounting seat (21) fixedly mounted around the inner wall of the electrodialysis desiliconizer (1), a plurality of groups of positioning columns (22) distributed in an annular shape are fixedly mounted on the top surface of the mounting seat (21), any group of the plurality of groups of positioning columns (22) distributed in an annular shape is adapted to have a limiting nut (23), a separation chamber (31) is arranged inside the silicon filter element (3), a mounting ring (32) is fixedly mounted around the top of the silicon filter element (3), and fixing screw holes (33) corresponding to the plurality of groups of positioning columns (22) distributed in an annular shape are penetrated through the mounting ring (32).

6. The device for removing silicon and extracting lithium based on electrodialysis according to claim 5, characterized in that: Any one of the plurality of groups of positioning columns (22) distributed in an annular shape is composed of a positioning section (221) and a threaded section (222), and the positioning section (221) passes through the interior of the fixing screw hole (33), while the limiting nut (23) and the threaded section (222) are spirally connected.

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